You're taking interface and interaction difficulties and disguising them as legitimate difficulty. I could think of a hundred ways to make the game more difficult (play with only the mouse or with only the keyboard, turn my monitor off and play by sound only, play only by watching my character on my wife's monitor as she plays in the same group on her own character, choose not to take half my talents, etc), but these things are not increasing the actual difficulty of the game. They're artificial masks.
Using addons to display information in a more logical fashion doesn't make the game easier, it reduces artificial modifiers that increase apparent difficulty for reasons that have nothing to do with player skill. If, having done so, the game is easy, then the game was always easy; the only thing that made it seem difficult was a poorly designed UI.